Cirsium heldreichii subsp. heldreichii

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 235

(a) Subsp. heldreichii :

Leaves attenuate at the base and sessile to narrowly auriculate-semiamplexicaul, not decurrent, arachnoid-lanate to -tomentose beneath. Involucre glabrous to sparsely arachnoid-hairy. Corolla white or pink. C. Greece.